Meeting%2036%20F%202010

Meeting%2036%20F%202010 - Meeting 36 Chapter 11 States of...

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1 Meeting 36 – Chapter 11 s In Chapter 11, we return to the macroscopic world and ask questions such as: why does ice float on water? Why does dry ice [CO 2 (s)] sublime at room temperature? We build on intramolecular forces to include intermolecular forces.
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2 Solids, liquids and gases (s, l, g) are phases: specific physical states of matter. Phase changes or Changes of State melting (s → l); freezing (l→S) vaporization (l → g); condensation (g → l) sublimation (s → g);deposition (gas → s)
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Vaporization (l → g) and Vapor Pressure Vaporization – High KE molecules in liquid leave surface, form vapor. In an insulated system, T drops; in an uninsulated system (beaker) heat enters system from surroundings & T changes less. Vaporization is always an endothermic process Reverse process called condensation Enthalpy of vaporization : amount of energy (at constant pressure) required to vaporize a substance Usually expressed as a molar quantity. Other things equal, ΔH
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This note was uploaded on 03/08/2011 for the course CHEM 161 taught by Professor Vacillian during the Fall '08 term at Rutgers.

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Meeting%2036%20F%202010 - Meeting 36 Chapter 11 States of...

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